1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Buoyancy (Weight of a barbell underwater)

  1. Jan 14, 2009 #1
    A bodybuilder is holding a 20-kg steel barbell above her head. How much force would she have to exert if the barbell were lifted underwater?

    Fb= Density x Volume x Gravity
    Density= mass/volume

    7860= 20/ V

    V= .00254 m^3
    Fb= 1000 x .00245 x 9.81
    Fb= 24.9174 N
  2. jcsd
  3. Jan 14, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    You've found the buoyant force, which is the force exerted by the water. But what's the force that she has to exert?
  4. Jan 14, 2009 #3
    I've never done this type of problem wouldnt it just be mass*bouancy force 24.917 * 20 kg =498.35N
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Buoyancy (Weight of a barbell underwater)
  1. Barbell Underwater (Replies: 6)

  2. Buoyancy and Weight (Replies: 5)